#include <openssl/x509.h> int X509_NAME_add_entry_by_txt(X509_NAME *name, const char *field, int type, const unsigned char *bytes, int len, int loc, int set); int X509_NAME_add_entry_by_OBJ(X509_NAME *name, ASN1_OBJECT *obj, int type, unsigned char *bytes, int len, int loc, int set); int X509_NAME_add_entry_by_NID(X509_NAME *name, int nid, int type, unsigned char *bytes, int len, int loc, int set); int X509_NAME_add_entry(X509_NAME *name,X509_NAME_ENTRY *ne, int loc, int set); X509_NAME_ENTRY *X509_NAME_delete_entry(X509_NAME *name, int loc);
The type of field is determined by type which can either be a definition of the type of bytes (such as MBSTRING_ASC) or a standard ASN1 type (such as V_ASN1_IA5STRING). The new entry is added to a position determined by loc and set.
X509_NAME_add_entry() adds a copy of X509_NAME_ENTRY structure ne to name. The new entry is added to a position determined by loc and set. Since a copy of ne is added ne must be freed up after the call.
X509_NAME_delete_entry() deletes an entry from name at position loc. The deleted entry is returned and must be freed up.
If instead an ASN1 type is used no checks are performed and the supplied data in bytes is used directly.
In X509_NAME_add_entry_by_txt() the field string represents the field name using OBJ_txt2obj(field, 0).
The loc and set parameters determine where a new entry should be added. For almost all applications loc can be set to -1 and set to 0. This adds a new entry to the end of name as a single valued RelativeDistinguishedName (RDN).
loc actually determines the index where the new entry is inserted: if it is -1 it is appended.
set determines how the new type is added. If it is zero a new RDN is created.
If set is -1 or 1 it is added to the previous or next RDN structure respectively. This will then be a multivalued RDN: since multivalues RDNs are very seldom used set is almost always set to zero.
``C=UK, O=Disorganized Organization, CN=Joe Bloggs''
X509_NAME *nm; nm = X509_NAME_new(); if (nm == NULL) /* Some error */ if (!X509_NAME_add_entry_by_txt(nm, MBSTRING_ASC, "C", "UK", -1, -1, 0)) /* Error */ if (!X509_NAME_add_entry_by_txt(nm, MBSTRING_ASC, "O", "Disorganized Organization", -1, -1, 0)) /* Error */ if (!X509_NAME_add_entry_by_txt(nm, MBSTRING_ASC, "CN", "Joe Bloggs", -1, -1, 0)) /* Error */
X509_NAME_delete_entry() returns either the deleted X509_NAME_ENTRY structure of NULL if an error occurred.